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`-5/7*2/11+9/7*(-5)/11+5/7`
`=-5/7*2/11+(-5)/7*9/11+5/7`
`=(-5/7)*2/11+(-5)/7*9/11+(-5/7)*(-1)`
`=(-5)/7*(2/11+9/11-1)`
`=(-5)/7*(11/11-1)`
`=(-5)/7*(1-1)`
`=(-5)/7*0`
`=0`
\(-\frac57.\frac{2}{11}+\frac97.\left(-\frac{5}{11}\right)+\frac57\)
\(=-\frac{10}{77}-\frac{45}{77}+\frac57\)
\(=-\frac{10}{77}-\frac{45}{77}+\frac{55}{77}\)
\(=\frac{-10-45+55}{77}\)
\(=\frac{0}{77}\)
\(=0\)
A = \(\frac{1}{1\times2}\) + \(\frac{1}{2\times3}\) + \(\frac{1}{3\times4}\) + ... + \(\frac{1}{19\times20}\) + \(\frac{1}{20\times21}\)
A = \(\frac11\) - \(\frac12\) + \(\frac12\) - \(\frac13\) + \(\frac13\) - \(\frac14\) + ... + \(\frac{1}{19}\) - \(\frac{1}{20}\) + \(\frac{1}{20}\) - \(\frac{1}{21}\)
A = \(\frac11\) - \(\frac{1}{21}\)
A = \(\frac{20}{21}\)
Ta có: \(\frac{1}{1\times2}+\frac{1}{2\times3}+\cdots+\frac{1}{20\times21}\)
\(=1-\frac12+\frac12-\frac13+\cdots+\frac{1}{20}-\frac{1}{21}\)
\(=1-\frac{1}{21}=\frac{20}{21}\)
1
unmanageable
2
indecisive
3
compulsory
4
encouragement
5
accompanied
6
unexpectedly
7
overconfident
8
geographical
9
breathtaking
10
effectiveness
- The boy was very violent and unmanageable. (manage)
- He can never make up his mind; he is very indecisive. (decide)
- Military service is no longer compulsory in South Africa. (compel)
- His parents gave him a lot of encouragement in his studies. (courage)
- Children under 12 accompanied by an adult can enter for free. (company)
- We always have a spare room in case visitors arrive unexpectedly. (expect)
- Even if you’re good at a game, you shouldn’t be overconfident. (confident)
- His geographical knowledge is very poor. He thinks Paris is in Italy. (geography)
- After climbing all day we were rewarded with a breathtaking view at the top. (breath)
- I don't doubt the effectiveness of this new gadget, but we simply don't have the money to buy it. (effect)
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các câu hỏi khó bạn nên đăng lên diễn đàn hỏi đáp để mọi người cùng giúp cậu nhé!
4.2\(^{3}\): (2\(^{3}\).\(\frac{1}{16}\))
= 4.8 : (8.\(\frac{1}{16}\))
= 32:\(\frac{1}{2}\)
= 32 x \(\frac{2}{1}\)
= 64
4.2\(^3\): (2\(^3\).\(\frac{1}{16}\))
= 4.8 : (8.\(\frac{1}{16}\))
= 32:\(\frac12\)
= 32 x \(\frac21\)
= 64
136 : ( 2x - 10 ) = 68
2x - 10 = 136 : 68
2x - 10 = 2
2x = 2 + 10
2x = 12
x = 12 : 2
x = 6
Vậy x = 6 .
Dịch: Câu đố. Anh ấy đang nghe một bài thánh ca. Họ đang chơi trò chơi ô chữ. Anh ấy đang chơi trò chơi ô chữ.
she's listening to a chant